# Search for the W-exchange decays $B^0 \to D_s^{(*)-} D_s^{(*)+}$

Abstract : We report a search for the decays $B^{0} \to D_{s}^{-} D_{s}^{+}$, $B^{0} \to D_{s}^{*-} D_{s}^{+}$, $B^{0} \to D_{s}^{*-} D_{s}^{*+}$ in a sample of 232 million $\Upsilon(4S)$ decays to \BBb ~pairs collected with the \babar detector at the PEP-II asymmetric-energy $e^+ e^-$ storage ring. We find no significant signal and set upper bounds for the branching fractions: ${\cal B}(B^{0} \to D_{s}^{-} D_{s}^{+}) < 1.0 \times 10^{-4}, {\cal B}(B^{0} \to D_{s}^{*-} D_{s}^{+}) < 1.3 \times 10^{-4}$ and ${\cal B}(B^{0} \to D_{s}^{*-} D_{s}^{*+}) < 2.4 \times 10^{-4}$ at 90% confidence level.
keyword :
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00025517
Contributor : Dominique Girod <>
Submitted on : Friday, January 27, 2006 - 3:58:05 PM
Last modification on : Wednesday, September 16, 2020 - 4:23:36 PM

### Citation

B. Aubert, R. Barate, D. Boutigny, F. Couderc, Y. Karyotakis, et al.. Search for the W-exchange decays $B^0 \to D_s^{(*)-} D_s^{(*)+}$. Physical Review D, American Physical Society, 2005, 72, pp.111101. ⟨10.1103/PhysRevD.72.111101⟩. ⟨in2p3-00025517⟩

Record views